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well if the shifts are all late then they may feel rough.This could be caused by a bad throttle psition sensor and this common on nissians. If the shifts are times correctly and you feel a slide - bang in 2nd then this is usually the beginning of the end.

my guess is that it might be a mount bad and your feeling it jump in the housing of the mount. its also possible that there is a computer malfunction but its not common. my last educated guess is that there is a mechanical problem in the transmission. but it the clutches are not slipping and you don't hear any noises and the fluid is at the right level then it doesn't sound likely. its hard for me to tell exactly without me being able to be there and diagnose it. try sitting in park and holding the brake. shift from drive to reverse and back again to see if it feels like its jerking into gear. if so i would really check for a bad mount. i work a little on rear wheel drive transmissions. but don't have much experience in front wheel drive ones. but they are similar. hope this helps. texastbone

When the car is just cruising along at approx.50+ MPH push the O/D button. You should feel the gears change higher and if you have an RPM guage then it should drop as well to fewer RPMs. This would be normal driving conditions. O/D will not kick in until the last regular gear (3rd or 4th depending on model) had been shifted into. O/D automatically kicks out when slowing down and the transmission shifts to a lower gear. Thus the O/D has no function at slower speeds/gears and does not need to be shifted ( on or off ) except in the very first example given here.